keys = ["name", "age", "gender", "city"]

dict1 = dict.fromkeys(keys)

new_items = [("country", "中国"), ("job", "软件工程师")]
dict1.update(new_items)

dict1.pop("age")

if dict1.get("gender"):
  print(dict1.get("gender"))

for k, v in dict1.items():
  print(k, v)
